Metalworking tool



June 19, 1945. D. STEPHENS 2,378,871

' METAL WORKINGTOOL Filed Sept. 25, 1942 INVENTOR Fgnfsel! .fl5Ze %e/7 ATTORNEY- Patented June 19, 1945 2,378,871 METALWORKING TOQL l l i Russell D. Stephens, Detroit, Mich, assigno r to The Murray Corporation of America, Detroit, Mich.,'a corporation of Delaware I a a i Application September 23, 1942,, S erial No. 459,417

a v a 9 Claims. This invention relates to methods and devices for burnishing and working metal, and particu- One application of the method and device of larlyto a method and device for eliminating scratches from metal or other materials.

the present invention is that of dressing out scratch marks which are present in the sheets 8 of metal employed for covering airplanes. Such sheets have a central core of aluminum alloy,

for providing durability and strength, which is clad on both sides with pure aluminum, to prevent oxidation. When the surface of a sheet 8 becomes scratched the core metal is exposed and subject to oxidation. To close the scratch marks the method and deviceof the present invention are employed tooperate on the aluminum at the sides of the mark and to work it The method embodies the rotation of an eccentrically mounted segmental spherical tip as it is advanced along the scratch mark for urging relation. The tip is mounted on a shaft in slightly off-center relation tothe axis of the j! UNITED STATES PATENT OFFICE or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction with the accompanying drawing, wherein;

, Figure, 1 is a view, in elevation, ofa driving tool and a scratch eliminating, tipembodying features of the invention; l l

Fig. 2 is an enlarged broken view of the illustrated on thetool in Fig. l; and

which the tip. is operating,

conventional. form,-having a chuck 6 which is back into its original position in the base of the f mark and into abutting sealing relation.

drivenin rotation thereby. Thechuck supports and drives a shaft 1 having a tip ;8, theaxis 9, ofwhich is offset from the axis ll of the shaft.

As the shaft 1 rotates the tip 8 will revolve about the axis of the shaft and the segmental spherical along a slot I 3 in-a sheet of material Id. The

tip will operate on the metal on each side of the,

scratch mark to work the metal into the base shaft which is secured in a chuckon the end of an electric drill or other device which rotates the shaft and revolves the tip about the shaft axis. This produces the working of the metal, and its movement into the scratch, the sealing of the metal, andthe polishing of the surface eliminates any appearance the operation. a Accordingly, the main objects of the invenof the scratch after tion are: to providea tip having a segmental abutted material; to provide a tool for rotating a shaft having a tip with a curved working surface, the axis of which is offset from the axis of the shaft for working the metal on either side of a scratch mark, and in general, to provide a methodand device for working metal which is simple in constructiompositive in operation,

and economical of manufacture.

Other objects andfeatures of novelty of this invention will be either specifically pointed out,

of themark and into abutting sealing relation,

The continuous rotation of the shaft and the revolving tip will polish the surface after the scratch mark is filledand sealed. The tool is preferably slowly moved back and forth along The base of the mark is filled with material as the material of the adjacentwalls is forced, into sealing relation. The further operation of the tool will the mark as the operation progresses.

polish the surface of the metal and the scratch mark will be quicklyeliminated.

The device and method eliminates the neces-. sity of scrapping stampingsand sub-assemblies the outer aluminum coating is cut through. The

aluminum on both sides of the scratch mark is moved into the mark and into abutting sealed relation, and the core material is completely protected against oxidation.

What is claimed is;

1. The method of eliminating scratch marks from the surface of a materialwhich includes the steps of, working the metal on both sides of tip Fig. 31s a view of the tipillustrated inFig. 2,. anda sheet of material having a scratch upon 2. The method of eliminating scratches from the surface of material which includes the steps of, rotating a point of engagement of a tool with the metal onwboth sides of. the scratch-in a circle scratch with the axis of the circle disposed normal to the scratch for simultaneously drawing: the metal on both sides thereof into the base of the,scratch and into intimate physical engage-='- ment for sealing the scratch. I a

3. The method of eliminatingalscratcnes irhm fromitheopposite-side of the tip from that having the surface of material which includes the-\steps.-.: of, rotating a point of engagement of a tool with the metal on both sides of the scratch -in"'-a' cir=-' cle of a diameter greater than the width-1 0i the scratch with the axis of the circle disposecl'northat of the shaft, and a rounded face concentric with the axis of the tip disposed on the end thereof opposite to that from which the shaft extends.

6. A tool for eliminating scratch marks from the surface of a material which includes, a shaft, a tip of greater diameter than said shaft disposed on the end of the shaft with its axis offset from-that of the shaft, atrounded face concentric withthe axisofnthe tip disposed on the endthereof opposite to that from which the shaft extends,

- and driving means for rotating said shaft.

'7; A device for eliminating scratch marks from the surface of a material which includes, a tip havingsrounded \surface on the axis thereof, a shaitlloflssdiameter than said tip extending the rounded surface, the axes of said shaft and 'ti'p beirigi offsetj anddriving means for rotating saidshafti BI'Th'e method of eliminating scratch marks fromi'an? aluminum'zcladfsheetfiof material iwhich includesratl'feqsteps of; simn-ltaneouslwmovingather' aluminumn at both-w sides 3 of: thee scratch: marks toward the ce-nter'of the markjtonfillzgtlre mark-hm ing the sui-face of the filld scratch by the' corr yimovements IateraI-Iy'acmssthe mark zandmhysh mired-operation of 'said 'toolt i a v 4, A device for elimina- "g sci aitche's from lthe surface of a material which includesi -a tlp hav ing a segmental spherical surface ai shaft offless callybonding; the aluminum: toform seal 1 for? thezmateriail. i

9: The ;method: of eliminating; scratch marks from Jan. aluminum :clad. sheet! of 1 material iwl'iiclr dia'rn'etrthai f saidi tip suppbrting said tifi with drcincludesi'thecstepslof,; simultaneously moving the itsaxis ofiset frorrrthe aizis of the'itip"; and means? for driving said shaft imrotati'om a 5; A tool 401 elirfiinatingsiscratch marks from the surface of arm'ateria'l which include's a shafty aluminum together fromzboth :sides. of the: scratchw markiby;-movements:laterallyaacross the markito; fill the mark, physicallymondingthevzaluminum to; form: a-seal*for' the-material; and polishing; the

atip of greatefdiarfietertthanisaid shaft'disposed :.surfacaofqtheeborrdedaluminum.

01f tl'ie end of'the shaft'fiwith its'iaxis offset from:

ossetti).-sschen n Na 

